from django.conf import settings
from django.core.mail import send_mail
from django_redis import get_redis_connection
from rest_framework import serializers

from users.models import User

from users.models import Address

from goods.models import SKU


class RegisterUserSerializer(serializers.ModelSerializer):
    # write_only: 只写,只校验, 不入库, 也不需要返回到前端浏览
    password2 = serializers.CharField(min_length=8, max_length=20, label="确认密码", write_only=True)
    sms_code = serializers.CharField(min_length=6, max_length=6, label="短信验证码", write_only=True)
    allow = serializers.CharField(label="协议", write_only=True)
    token = serializers.CharField(label="jwt口令", read_only=True)

    class Meta:
        model = User
        fields = ("id", "username", "password", "password2", "mobile", "sms_code", "allow","token")

        read_only_fields = ("id",)

        extra_kwargs = {
            "password": {
                "min_length": 8,
                "max_length": 20,
                "write_only": True
            }
        }

    # 1,单字段校验,allow协议
    def validate_allow(self, value):
        if value != 'true':
            raise serializers.ValidationError("必须同意协议")

        return value



    # 2,校验多字段, 密码, 短信
    def validate(self, attrs):

        # 0,取出手机号,和短信验证码
        sms_code = attrs["sms_code"]
        mobile = attrs["mobile"]

        # 1,校验密码
        if attrs["password"] != attrs["password2"]:
            raise serializers.ValidationError("两次密码不相等")

        # 2,校验短信
        redis_conn = get_redis_connection("code")
        redis_sms_code = redis_conn.get("sms_code_%s" % mobile)

        # 3,判断是否过期
        if not redis_sms_code:
            raise serializers.ValidationError("短信验证码已经过期")

        # 4,校验正确性
        if sms_code != redis_sms_code.decode():
            raise serializers.ValidationError("短信验证码填写错误")

        # 5,返回
        return attrs

    # 3,由于User中没有password2,sms_code,allow,所以需要去除
    def create(self, validated_data):
        # 1,去除不需要的数据
        del validated_data["password2"]
        del validated_data["sms_code"]
        del validated_data["allow"]

        # 2,创建对象
        user = super(RegisterUserSerializer, self).create(validated_data)

        # 2,1密码加密
        user.set_password(validated_data["password"])  # 修改的代码
        user.save()

        # 设置JWT
        from rest_framework_jwt.settings import api_settings
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)
        user.token = token



        # 3,返回
        return user


class UserInfoSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ("id","username","mobile","email","email_active")


class EmailSendSerializer(serializers.Serializer):
    email = serializers.EmailField(label="邮箱")

    def update(self, instance, validated_data):
        # 1,将邮箱设置到用户对象
        email = validated_data["email"]
        instance.email = email
        instance.save()

        # 2,发送邮件
        verify_url = instance.generate_verify_url()
        # from celery_tasks.email.tasks import send_verify_url
        # send_verify_url.delay(verify_url, email)  # 使用celery发送

        send_mail(subject="请你点击验证,来自美多国际商城", message=verify_url,
                  from_email=settings.EMAIL_FROM,
                  recipient_list=[email])

        # 3,返回
        return validated_data



class AddressSerializer(serializers.ModelSerializer):

    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label="省id")
    city_id = serializers.IntegerField(label="市id")
    district_id = serializers.IntegerField(label="区id")

    class Meta:
        model = Address
        exclude = ("user","is_deleted","create_time","update_time")

        # 重写序列化器的create方法,目的为了补充user

    def create(self, validated_data):
        validated_data["user"] = self.context["request"].user
        return super(AddressSerializer, self).create(validated_data)

class AddressTitleSerializer(serializers.ModelSerializer):
    class Meta:
        model = Address
        fields = ("title",)


class UserBrowerHistorySerializer(serializers.Serializer):
    sku_id = serializers.IntegerField(min_value=1, label="商品编号")

    # 1,单字段校验
    def validate_sku_id(self, value):
        # 1,通过sku_id获取sku对象
        try:
            sku = SKU.objects.get(id=value)
        except Exception as e:
            raise serializers.ValidationError("商品不存在")

        # 2,返回
        return value

    # 2,重写create方法,需要保存记录到redis中
    def create(self, validated_data):
        # 1,获取sku_id
        sku_id = validated_data.get("sku_id")
        user = self.context["request"].user

        # 2,获取redis对象
        redis_conn = get_redis_connection("history")

        # 3,去重
        redis_conn.lrem("history_%s" % user.id, 0, sku_id)

        # 4,存储
        redis_conn.lpush("history_%s" % user.id, sku_id)

        # 5,截取5条
        redis_conn.ltrim("history_%s" % user.id, 0, 4)

        # 6,返回
        return validated_data